Mark Cason wrote: > Can anybody recommend what type and shape of insert to use to turn a > 2" piece of pre-hardened 4140? > > I need to get a fairly decent finish, and I understand I will need > one insert for roughing, and a different one for finishing. It's a part > for my CNC mill, and I will be turning it on my 12x36 lathe. > It depends a bit on the lathe. If you have the rigidity and power, a negative rake coated carbide sounds like it would be right. Otherwise, positive rake coated carbide would be better.
For the best finish, of course, you can grind it after the roughing pass. Jon ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
